Web roll stand



R. B. THATCHER WEB ROLL STAND Nov. 28, 1967 2 Sheets-Sheet 1 Filed Jan.11, 1966 INVENTOR ROBERT 8. THA TCHER ATTORNEYS Nov. 28, 1967 R. B.THATCHER WEB ROLL STAND 2 Sheets-Sheet 2 Filed Jan. 11, 1966 INVENTORROBERT E. THATCHER ATTORNEYS ABSTRACT OF THE DISCLOSURE A web roll standhaving particular utility in printing presses wherein the web is trainedabout a pendantly mounted sensing roll which is operatively connected toa lever pivoted on one of a pair of clamp type brake shoes with suchlever engaging a pin operative to move the brake shoes apart to vary thebraking pressure below a preset maximum.

This invention relates generally as indicated to a web roll stand andmore particularly to such roll stand incorporating an improved Web rollbraking mechanism.

Web roll stands for printing presses and the like usually incorporate aweb tension responsive brake mechanism for the roll which conventionallyutilize complex linkages connected to sensing rolls. Moreover, on manyconventional web brake mechanisms, quick changes in the speed of the webmay cause the brake to tighten actually stopping the roll and therebyincreasing the possibility of web breakage. Printing press brakemechanisms must also be highly sensitive since anything affecting thespeed of the web will, of course, change the tension on the web and therelatively massive web rolls must react accordingly. With the presentinvention the desired web tension may be preset and when the web becomestighter than the original setting, the tension sensing roll will releaseor open the mechanism, but such mechanism cannot exert more pressure orclose beyond its original preset position.

It is accordingly a principal object of the present invention to providea web roll stand incorporating a web roll brake which is highlysensitive yet of a simplified construction.

A further principal object is the provision of a web roll brakemechanism wherein the brake cannot exert more pressure or close beyondits original preset condition.

Another object is the provision of a web roll brake mechanism whereinthe sensing roll may be mounted for substantially free pendant swingingmovement.

Yet another object is the provision of a web roll brake mechanismincorporating a lever and push rod on one brake shoe connected to thesensing roll operative to open the brake mechanism in response totension variations beyond its original setting.

A still further object is the provision of a web roll brake mechanismwhich can readily be released from the brake drum to facilitate thereplacement of rolls.

Other. objects and advantages of the present invention will becomeapparent as the following description proceeds.

To the accomplishment of the foregoing and related ends,- the invention,then, comprises the features hereinafter fully described andparticularly pointed out in the claims, the following description andthe annexed drawei d S ate ing setting forth in detail a certainillustrative embodiment of the invention, this being indicative,however, of but one of the various ways in which the principles of theinvention may be employed.

In said annexed drawing: v 7

FIG. 1 is a side elevation of a roll stand in accordance with thepresent invention mounted on a web press-shown in phantom lines; 7

FIG. 2 is an enlarged side elevation of the brake mechanism ofthe rollstand;

FIG. 3 is an end elevation of such brake mechanism taken substantiallyfrom the line 3 3 of FIG. 2;

FIG. 4 is a fragmentary view similar to FIG. 2 illustrating the mannerin which the brakemechanism separates to permit roll changes; and

FIG. -5 is a fragmentary perspective view of the web roll brakemechanism of the present invention.

Referring now to such'annexed drawings and more particularly to FIG. 1,the web roll stand is illustrated at 1 and may comprise a base 2provided with structural colurnns Sand 4 on each side. Such columns arejoined at the top by structural member 5 and near the bottom bystructural member 6. Pairs of supports 8 are provided at the top'of'thecolumn 3 projecting rearwardly thereof forthe shaft 9 of a top web roll10. Closer to the bottom, pairs of supports 11 are provided eachsupported by a gusset 12 for the shaft 13 of lower web roll 14.

The web 16 being fed from the roll 10 passes about a sensing roll 17pendantly mounted on arms 18 pivoted at 19 to the column 4 and thenabout an idler roll 20 journalled in the column 3 and from there passesto printing assembly 21 stacked on top of printing assembly 22. The web23 being fed from the roll 14 passes in like manner about sensing roll24 and idler roll 25 and then into the lower printing assembly 22. Fromthe printing assemblies 21 and 22 the webs then pass to folding unit 26.The printing assemblies and the folder unit are mounted on a commonframe or base 27 and include a top frame 28 to which the roll stand 1may readily be secured or removed.

The sensing roll 24 is like the roll 17 pendantly mounted on arms 29pivoted at 30 to the column 4 and for each roll unit a rod 31interconnects the shaft or pivot 30 with the brake unit shown generallyat 32. The sensing rolls, connecting rods and brake units for the topand bottom rolls 10 and 14, respectively, may be substantially identicalin form and accordingly only the bottom unit will be described indetail. It will, of course, be appreciated that a roll stand using asingle roll or more than the two rolls illustrated may readily beemployed. 7

Referring now to FIGS. 2, 3 and 5 it will be seen that the shaft 13 ofthe roll 14 is provided with a brake drum or pulley 34 having a hub 35which may be secured to the shaft in a manner to prevent "relativerotation as by the key illustrated; The shaft 13 is supported simply onsaddle bearing surfaces 36 on the supports 11 projecting from the column3. The drum 34 is provided with a V- shape groove 37 which receivesbrake shoes 38 and 39 of complementary shape supported on the interiorof semicircular brake shoe holders 40 and 41, respectively. Such brakeshoes may be provided with wood or like material linings operativefrictionally to engage and thus grip the V- shape groove in the brakedrum. 7

The brake shoe helders- 40 and 41 are pivoted together on shaft 43Vertically beiiath the shaft 13 and as seen more clearly in FIG. 3, suchshaft includes an inner threaded portion 44 threaded in nut 45 securedto the frame projection 11. The outer end of the shaft 43 is providedwith a hand wheel 46 by means of which such shaft can be rotated. Thebrake holder 40 may be bifurcated at its lower end to straddle a tongueportion of the brake holder 41 and On each side of such brake holders atthe shaft 43, collars 47 and 48 may be secured to such shaft to providea trap unit. The brake shoe holders are in this manner confined forlongitudinal movement with the shaft 43 which can be obtained byrotating the hand wheel 46. Thus, alignment of the entire brake assemblyincluding the roll shaft 13 and the web 23 may be obtained simply byrotating the hand wheel 46.

As perhaps best seen in FIG. 5, the top of the brake shoe holder 40 isprovided with a U-shape slot 50 adapted freely to receive rod 51threaded as indicated at 52 at one end and provided with an eye 53 atthe other. A knob 54 is threaded on the projecting end of the rod and acompression spring 55 extends between the knob and a pressure washer 56.The pressure washer 56 is, of course, of a diameter sutficient tostraddle the slot 50. The eye 53 is pivoted to pin 57 extending throughslot 58 in the upper end of brake shoe holder 41.

In the position shown in FIG. 5 the two brake shoe holders or halves areclamped together by the pressure of the spring 55 and such pressure maybe controlled or preset by adjustment of the knob 54 on the threaded endportion 52 of the rod 51. In this manner the maximum brake pressure canbe preset to obtain maximum web tension and the brake cannot exert morepressure or close beyond this preset condition.

To separate the brake shoe holders or halves 40 and 41 beyond theiroriginal preset braking position, there is provided a release lever 60pivotally connected at 61 at its lower end to rod 31 and just short ofthe top of the lever to holder 41 by pin 62. The release lever 60 may bejournalled on such pin 62 by means of needle or like bearings and suchpin extends through slot 63 provided by the projections 64 and 65 on theexterior of the brake shoe holder 41. The lever 60 is provided with adogleg or bend 66 and conforms fairly closely to the exterior of theholder 41. The upper end of the lever 60 projects a short distance abovethe projections 64 and 65 and engages but is not connected to releasepin or rod 68 which extends through and loosely fits in bore 69 (FIG. 2)in the top portion of the holder 41 directly beneath the slot 58. Therelease pin 68 may be provided with rounded ends with one end engagingthe upward projection 70 of the release lever 60 and the opposite endengaging stop button 71 threaded in tapped aperture 72 in the holder 40directly beneath the slot 50. The button 71 may be provided with aslotted end so that it can be adjusted in the tapped aperture 72 bymeans of a screwdriver and the like. The adjustment of the button 71controls the presence or absence of any play between the leverprojection 70, the pin 68 and such button and may be employed tocompensate for wear.

The operation of the lever 60 is obtained by the rod connection 31 whichas seen in FIG. 2 is threadedly adjustably connected to sphericalbearing units 75 and 76 and at the end opposite the pivot 61, pivot 77extending through spacer 78 into the upper projection 79 of bell crank80 secured to the shaft or pivot 30. The forwardly extending projection81 of such bell crank is pin con- .nected to eye 82 of rod 83 extendingthrough bracket 84 secured to the column frame 4. The upper end of therod 83 is provided with a nut 85 threaded thereon and a compressionspring 86 extends between the nut and bracket urging the rod 83 upwardlyand thus the shaft 30 in a counterclockwise direction as viewed in FIG.2.

Sensing roll 24 is journalled onshaft 87 secured to the lower ends ofthe arms 29 which are in turn secured to clamps 88 held by clamp screws89 to the shaft 30. The Sensing roll 24 is thus pendantly mounted on thearms 29 directly beneath the shaft 30 and it will be seen that thesensing roll will because of its own weight tend to move to the fullline position shown in FIG. 2.

In operation as the tension of the web 23 becomes tighter, the sensingroll 24 will move to the phantom line positions shown at 91 or 92pivoting the haft 30 against the pressure of spring 86 moving the rod 31to the right as seen in FIG. 2 and pivoting the lever 60 about the pivot62 in a counterclockwise direction to cause the upper projection 70thereof to push release pin 68 against the adjustable button 71 causingthe brake shoe holders 40 and 41 to separate against the pressure ofspring 55. Because of the ratio of the distances between the center ofthe sensing roll 24, the pivot 30 and the pivot 77 as well as the ratioof the distances between the pivots 61, 62 and the point of engagementbetween the upper projection 70 of the lever 66 and the release pin 68,it can be seen that a substantial mechanical advantage is obtained. Itis also apparent that substantial movement of the sensing roll 24 willobtain but a relatively small movement of separation of the brake shoesbut sufficient to obtain the desired brake control. In the illustratedembodiment the ratio of moment arms produced by the lever 60 isapproximately 9:1 while the ratio of moments in the sensing roll supportarms 29 is approximately 5: 1.

Referring now to FIG. 4 it can be seen that the proximity of the pivots43 and 61 permits the brake shoe holders 40 and 41 to be separatedsimply by pivoting the rod 51 in a clockwise direction about the pivot57 and permitting the holders to fall apart or separate pivoting inopposite directions about the shaft 43. A new web roll may then simplybe set in place in the saddle bearings on the supports 11 and the brakeshoe holders may then be enclosed about the drum 34 and the rod 51pivoted back into the slot 50 to hold the brake shoe halves together atthe desired force set by the knob 54. The rod 31 in this manner does nothave to be disconnected and the replacement of web rolls becomes anextremely simplified procedure.

It can now be seen that there is provided a highly sensitive yetsimplified web brake mechanism having positive tension control. Thesetting of the tension control by means of the knob 54 provides thedesired web tension and when the web becomes more taut than the originalsetting, the sensing roll 24 will release or open the brake mechanism,but in no manner can exert more pressure or close the brake beyond itsoriginal preset position. Lateral positioning of the web is controlledby the knob 46 adjusting both the brake mechanism and the web rolllaterally and when a new roll is required, the brake shoes are openedsimply by releasing the tension control knob 54 and lifting the rod 51from the slot 50 to permit the brake shoes to fall apart away from thebrake drum.

Other modes of applying the principles of the invention may be employed,change being made as regards the details described, provided thefeatures stated in any of the following claims or the equivalent of suchbe employed.

I, therefore, particularly point out and distinctly claim as myinvention:

1. A roll stand for web rolls and the like comprising a web roll shaftsupport, a brake drum mounted on such web roll shaft, a pair of brakeshoes mounted on holders pivoted together beneath such shaft, meansoperative yieldingly to hold said holders together about said drum toexert a predetermined maximum braking pressure thereon, and meansresponsive to variations of tension on the web payed from such rollinstantaneously to vary such braking pressure below the predeterminedmaximum by prying said holders apart.

2. A roll stand as set forth in claim 1 wherein said last-mentionedmeans comprises a sensing roll in engagement with such web, andmechanical advantage link means interconnecting said sensing roll andsaid brake .shoe holders operative resiliently to force said holdersapart in response to increased tension on such Web.

3. A roll stand as set forth in claim 2 wherein said mechanicaladvantage link means includes a pair of arms pendantly supporting saidsensing roll and a release lever pivoted to one of said holders.

4. A roll stand as set forth in claim 3 including a release pinprojecting freely through one of said holders and engaging the oppositeholder, said release lever being in engagement with said release pin.

5. A roll stand as set forth in claim 3 including a pivot shaftconnected to said arms, and a rod interconnecting said pivot shaft andsaid release lever.

6. A roll stand as set forth in claim 3 including spring means operativeto urge said sensing roll in a direction to obtain such predeterminedbraking pressure.

7. A roll stand as set forth in claim 1 wherein said holders arecoaxially pivoted on an axially adjustable shaft beneath such rollshaft, a trap unit confining such holders to such pivot shaft for axialmovement therewith, and means operative axially to move said shaftlaterally to adjust said brake shoes and thus such web roll.

8. A roll stand for web rolls and the like comprising a web roll shaftsupport, a brake drum mounted on such web roll shaft, a pair of brakeshoes mounted on holders pivoted together beneath such shaft, meansoperative yieldingly to hold said holders together about said drum toexert a predetermined maximum braking pressure thereon, and meansresponsive to variations of tension on the web payed from such roll tovary such braking pressure below the predetermined maximum; saidlastmentioned means comprising a sensing roll in engagement with suchweb, mechanical advantage link means interconnecting said sensing rolland said brake shoe holders operative resiliently to force said holdersapart in response to increased tension on such web, said mechanicaladvantage link means including a pair of arms pendantly supporting saidsensing roll and a release lever pivoted to one of said holders, arelease pin projecting freely through one of said holders and engagingthe opposite holder, said release lever being in engagement with saidrelease pin, and an adjustable button on said opposite holder engaged bysaid release pin.

References Cited UNITED STATES PATENTS 1,829,337 10/1931 Brueshaber242-75.43 1,987,329 1/1935 Fankboner -24275.43 2,972,452 2/ 1961 Aumann242-75.43

FRANK I COHEN, Primary Examiner.

N. L. MINTZ, Assistant Examiner.

1. A ROLL STAND FOR WEB ROLLS AND THE LIKE COMPRISING A WEB ROLL SHAFTSUPPORT, A BRAKE DRUM MOUNTED ON SUCH WEB ROLL SHAFT, A PAIR OF BRAKESHOES MOUNTED ON HOLDERS PIVOTED TOGETHER BENEATH SUCH SHAFT, MEANSOPERATIVE YIELDINGLY TO HOLD SAID HOLDERS TOGETHER ABOUT SAID DRUM INEXERT A PREDETERMINED MAXIMUM BRAKING PRESSURE THEREON, AND MEANSRESPONSIVE TO VARIATIONS OF TENSION ON THE WEB PAYED FROM SUCH ROLLINSTANTANEOUSLY TO VARY SUCH BRAKING PRESSURE BELOW THE PREDETERMINEDMAXIMUM BY PRYING SUCH HOLDERS APART.